INCORPORATION OF ORBITAL DYNAMICS TO IMPROVE WIDE-AREA DIFFERENTIAL GPS

Juan Ceva, Willy Bertiger, Ronald Muellerschoen, Thomas Yunck and Bradford Parkinson

Peer Reviewed

Abstract: A powerful dynamical technique for computing precise GPS satellite orbits for the FAA’s Wide-Area Augmentation System (WAAS) has been evaluated. This method yields more accurate and robust orbit solutions than nondynamical approaches while enabling complete separation of orbit and satellite clock errors for reliable integrity monitoring. Experimental results with real data show that a network of 13 monitor stations distributed over North America, producing dual-frequency pseudorange data, yields orbit accuracies a factor of 3 better than current broadcast orbits within the service volume. WAAS simulations comparing orbit solutions and user positioning results obtained with the broadcast, dynamical, and nondynamical orbits are presented. The dynamical orbit estimation technique produces the most accurate user results. The tests show that dynamical orbit estimation and the slow correction computation are easily achievable in the real-time WAAS scenario.
Published in: NAVIGATION, Journal of the Institute of Navigation, Volume 44, Number 2
Pages: 171 - 180
Cite this article: Ceva, Juan, Bertiger, Willy, Muellerschoen, Ronald, Yunck, Thomas, Parkinson, Bradford, "INCORPORATION OF ORBITAL DYNAMICS TO IMPROVE WIDE-AREA DIFFERENTIAL GPS", NAVIGATION, Journal of The Institute of Navigation, Vol. 44, No. 2, Summer 1997, pp. 171-180.
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